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an Open Source BPMN 2.0 Modeler
There is a newer version: 2.2.18
package org.yaoqiang.bpmn.model.elements;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * XMLCollection
 * 
 * @author Shi Yaoqiang([email protected])
 */
public abstract class XMLCollection extends XMLElement {

	protected LinkedHashMap elements = new LinkedHashMap();

	public XMLCollection(XMLElement parent) {
		super(parent);
	}

	public XMLCollection(XMLElement parent, String name) {
		super(parent, name);
	}

	public abstract XMLElement generateNewElement();

	public abstract String getElementName();

	public void set(String name, String value) {
		XMLElement el = get(name);
		if (el != null) {
			el.setValue(value);
		} else {
			throw new RuntimeException("No such element!");
		}
	}

	public void add(XMLElement el) {
		if (el == null) {
			return;
		}
		if (el instanceof XMLComplexElement && ((XMLComplexElement) el).get("id") != null && !((XMLComplexElement) el).get("id").toValue().equals("")) {
			elements.put(((XMLComplexElement) el).get("id").toValue(), el);
		} else {
			int id = elements.size();
			while (contains(String.valueOf(id))) {
				id++;
			}
			elements.put(String.valueOf(id), el);
		}
		el.setParent(this);
	}

	public void addAll(List els) {
		if (els != null && els.size() > 0) {
			for (XMLElement el : els) {
				add(el);
			}
		}
	}

	public XMLElement remove(String id) {
		return elements.remove(id);
	}

	public XMLElement getCollectionElement(String id) {
		for (XMLElement ce : elements.values()) {
			if (((XMLComplexElement) ce).get("id").toValue().equals(id)) {
				return ce;
			}
		}
		return null;
	}

	public int size() {
		return elements.size();
	}

	public void clear() {
		elements.clear();
	}

	public boolean isEmpty() {
		return elements.size() == 0;
	}

	public List toElements() {
		return new ArrayList(elements.values());
	}

	public List getXMLElements() {
		List els = new ArrayList();
		for (XMLElement el : elements.values()) {
			if (!(el instanceof XMLAttribute)) {
				els.add(el);
			}
		}
		return els;
	}

	public String createId(String baseId) {
		int num = 1;
		String id = baseId + "_" + num;
		while (getCollectionElement(id) != null) {
			num++;
			id = baseId + "_" + num;
		}
		return id;
	}

	public XMLElement get(String name) {
		return elements.get(name);
	}

	public boolean contains(String id) {
		return elements.containsKey(id);
	}

	public Object clone() {
		XMLCollection d = (XMLCollection) super.clone();
		d.elements = new LinkedHashMap();
		for (Map.Entry entry : elements.entrySet()) {
			String key = new String(entry.getKey());
			XMLElement value = (XMLElement) entry.getValue().clone();
			value.setParent(d);
			d.elements.put(key, value);
		}
		return d;
	}

}